/*
 * @Author: C.
 * @Date: 2021-06-11 09:39:51
 * @LastEditTime: 2021-06-17 15:51:01
 * @Description: file content
 */
const dialogDrag =
  {

    bind (el, binding, vnode, oldVnode) {
      // 弹框可拉伸最小宽高

      let minWidth = 400

      let minHeight = 300

      // 初始非全屏

      let isFullScreen = false

      // 当前宽高

      let nowWidth = 0

      let nowHight = 0

      // 当前顶部高度

      let nowMarginTop = 0

      // 获取弹框头部（这部分可双击全屏）

      const dialogHeaderEl = el.querySelector('.el-dialog__header')

      // 弹窗

      const dragDom = el.querySelector('.el-dialog')

      // 给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；

      dragDom.style.overflow = 'auto'

      // 清除选择头部文字效果

      // dialogHeaderEl.onselectstart = new Function("return false");

      // 头部加上可拖动cursor

      dialogHeaderEl.style.cursor = 'move'

      // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);

      const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null)

      let moveDown = (e) => {
        // 鼠标按下，计算当前元素距离可视区的距离

        const disX = e.clientX - dialogHeaderEl.offsetLeft

        const disY = e.clientY - dialogHeaderEl.offsetTop

        // 获取到的值带px 正则匹配替换

        let styL, styT

        // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px

        if (sty.left.includes('%')) {
          styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100)

          styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100)
        } else {
          styL = +sty.left.replace(/\px/g, '')

          styT = +sty.top.replace(/\px/g, '')
        };

        document.onmousemove = function (e) {
          // 通过事件委托，计算移动的距离

          const l = e.clientX - disX

          const t = e.clientY - disY

          // 移动当前元素

          dragDom.style.left = `${l + styL}px`

          dragDom.style.top = `${t + styT}px`

          // 将此时的位置传出去

          // binding.value({x:e.pageX,y:e.pageY})
        }

        document.onmouseup = function (e) {
          document.onmousemove = null

          document.onmouseup = null
        }
      }

      dialogHeaderEl.onmousedown = moveDown

      // 双击头部全屏效果

      dialogHeaderEl.ondblclick = (e) => {
        if (isFullScreen === false) {
          nowHight = dragDom.clientHeight

          nowWidth = dragDom.clientWidth

          nowMarginTop = dragDom.style.marginTop

          dragDom.style.left = 0

          dragDom.style.top = 0

          dragDom.style.height = '100VH'

          dragDom.style.width = '100VW'

          dragDom.style.marginTop = 0

          isFullScreen = true

          dialogHeaderEl.style.cursor = 'initial'

          dialogHeaderEl.onmousedown = null
        } else {
          dragDom.style.height = 'auto'

          dragDom.style.width = nowWidth + 'px'

          dragDom.style.marginTop = nowMarginTop

          isFullScreen = false

          dialogHeaderEl.style.cursor = 'move'

          dialogHeaderEl.onmousedown = moveDown
        }
      }

      dragDom.onmousemove = function (e) {
        let moveE = e

        if (e.clientX > dragDom.offsetLeft + dragDom.clientWidth - 10 || dragDom.offsetLeft + 10 > e.clientX) {
          dragDom.style.cursor = 'w-resize'
        } else if (el.scrollTop + e.clientY > dragDom.offsetTop + dragDom.clientHeight - 10) {
          dragDom.style.cursor = 's-resize'
        } else {
          dragDom.style.cursor = 'default'

          dragDom.onmousedown = null
        }

        dragDom.onmousedown = (e) => {
          const clientX = e.clientX

          const clientY = e.clientY

          let elW = dragDom.clientWidth

          let elH = dragDom.clientHeight

          let EloffsetLeft = dragDom.offsetLeft

          let EloffsetTop = dragDom.offsetTop

          dragDom.style.userSelect = 'none'

          let ELscrollTop = el.scrollTop

          // 判断点击的位置是不是为头部

          if (clientX > EloffsetLeft && clientX < EloffsetLeft + elW && clientY > EloffsetTop && clientY < EloffsetTop + 100) {

            // 如果是头部在此就不做任何动作，以上有绑定dialogHeaderEl.onmousedown = moveDown;

          } else {
            document.onmousemove = function (e) {
              e.preventDefault() // 移动时禁用默认事件

              // 左侧鼠标拖拽位置

              if (clientX > EloffsetLeft && clientX < EloffsetLeft + 10) {
                // 往左拖拽

                if (clientX > e.clientX) {
                  dragDom.style.width = elW + (clientX - e.clientX) * 2 + 'px'
                }

                // 往右拖拽

                if (clientX < e.clientX) {
                  if (dragDom.clientWidth < minWidth) {

                  } else {
                    dragDom.style.width = elW - (e.clientX - clientX) * 2 + 'px'
                  }
                }
              }

              // 右侧鼠标拖拽位置

              if (clientX > EloffsetLeft + elW - 10 && clientX < EloffsetLeft + elW) {
                // 往左拖拽

                if (clientX > e.clientX) {
                  if (dragDom.clientWidth < minWidth) {

                  } else {
                    dragDom.style.width = elW - (clientX - e.clientX) * 2 + 'px'
                  }
                }

                // 往右拖拽

                if (clientX < e.clientX) {
                  dragDom.style.width = elW + (e.clientX - clientX) * 2 + 'px'
                }
              }

              // 底部鼠标拖拽位置

              if (ELscrollTop + clientY > EloffsetTop + elH - 20 && ELscrollTop + clientY < EloffsetTop + elH) {
                // 往上拖拽

                if (clientY > e.clientY) {
                  if (dragDom.clientHeight < minHeight) {

                  } else {
                    dragDom.style.height = elH - (clientY - e.clientY) * 2 + 'px'
                  }
                }

                // 往下拖拽

                if (clientY < e.clientY) {
                  dragDom.style.height = elH + (e.clientY - clientY) * 2 + 'px'
                }
              }
            }

            // 拉伸结束

            document.onmouseup = function (e) {
              document.onmousemove = null

              document.onmouseup = null
            }
          }
        }
      }
    }

  }
export {
  dialogDrag
}
